When you ask "What number is halfway between 20 and 889?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=889.
To find the number halfway between 20 and 889, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 889 into our formula, we get:
(20 + 889)/2 = 454.5
Thus, the number halfway between 20 and 889 is 454.5.
To check that our answer is correct, we subtract 20 from 454.5 and subtract 454.5 from 889 and compare the two numbers:
454.5 - 20 = 434.5
889 - 454.5 = 434.5
As you can see, the halfway number is 434.5 higher than 20 and 434.5 lower than 889. Therefore, our halfway between answer of 454.5 above is correct.
Halfway Between
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Halfway Between 20 and 890
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